//
//  main.m
//  OCChapter1
//
//  Created by 郭家正 on 2019/1/5.
//  Copyright © 2019 TM. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    NSLog(@"Hello, World!");
    for (int i=0; i<10; i++) {
        NSLog(@"%d",i);
    }
    int a;
    long b;
    NSInteger c;//long和int
    CGFloat d;//double也float
    BOOL e;//bool 1和0 YES和NO
    return 0;
}
